WYOMING -- Public utility leaders were trying to determine the amount of sewage that flowed into Buck Creek from a collection pipe, near 44th Street and Spartan Industrial Drive SW, that was intentionally clogged with large tree branches.

Officials were alerted to the spilling, untreated wastewater about 9 a.m. Tuesday and had fixed the problem before noon. It's not clear when the raw sewage began overflowing, but started when a manhole cover was removed and the pipe stuffed with limbs.

Tests were being conducted for E. coli and other contaminants, Utility Department Superintendent Tom Kent said.

City employees have bolted the manhole shut. Kent was uncertain of the health risk, because it had not been determined how much sewage overflowed or the breach's duration.